construction-estimator

name: construction-estimator description: Professional BOQ and Pricing Engine. Uses DDC-CWICR methodology for resource-based costing (Material/Labor/Machinery split). Use when you need to generate priced tenders, apply profit markups, calculate contingency, or normalize item lists to international standards (OmniClass/Uniclass).

Construction Estimator (DDC-CWICR)

This skill provides a structured workflow for generating professional construction estimates based on the DDC-CWICR open-source database and methodology.

Core Capabilities

1. Resource-Based Costing: Decomposing work items into labor, material, and machinery components.
2. BOQ Normalization: Mapping user-provided descriptions to standard DDC work item codes and units.
3. Markup & Margin Analysis: Applying professional markups for contingency, overhead, and profit.
4. Multilingual Support: Handling technical construction terms in 9 languages (including Thai).

Usage Instructions

1. Data Analysis

When analyzing project drawings or PDFs, categorize work items according to the DDC Schema.

2. Rate Estimation

Follow the Resource-Based Costing Methodology. For each major work item, estimate the resource split:

• Material: Raw cost + wastage.
• Labor: Man-hours * hourly rate (including night-shift premiums if applicable).
• Machinery: Equipment hours * rental rate.

3. Calculations

Use the provided scripts/estimate_utils.py to perform consistent calculations for markups.

4. Output Formatting

Present BOQs in a clean, hierarchical structure:

• Bill 1: Preliminaries
• Bill 2: Site Preparation / Demolition
• Bill 3+: Specialized Trades (Architectural, M&E, Furniture)

References

• DDC 85-Field Schema
• Estimation Methodology